Retrieval Sentence Utilization Device and Retrieval Sentence Utilization Method

2. The retrieval sentence utilization device according to claim 1, wherein the one or more processors place, in the directed graph, a node corresponding to an object of an event that occurs later relative to a node corresponding to an object of an event that occurs earlier in such a way that it is possible to identify the later occurring event occurs after the earlier occurring event occurs.

5. The retrieval sentence utilization device according to claim 1, wherein the one or more processors regard the directed graphs generated by unifying at least common subtrees in corresponding event as candidates for the new directed graph, and then designate the candidate which does not include a loop as the new directed graph.

9. The computer-implemented retrieval sentence utilization method according to claim 8, wherein, when generating the directed graph, a node corresponding to an object of an event that occurs later is placed in the directed graph relative to a node corresponding to an object of an event that occurs earlier in such a way that it is possible to identify the later occurring event occurs after the earlier occurring event occurs.

11. The computer readable information recording medium according to claim 9, wherein the program causes the computer to, when generating the directed graph, execute placing, in the directed graph, a node corresponding to an object of an event that occurs later relative to a node corresponding to an object of an event that occurs earlier in such a way that it is possible to identify the later occurring event occurs after the earlier occurring event occurs.